ABSTRACT: Aspergillus species take up various metal ions from environment. The morphology of Aspergillus oryzae strains can vary under the influence of various metal ions. Here, the effects of Ti4+, V3+, Sr2+, Ba2+, Al3+, Fe2+, Zn2+, Mn2+, Ca2+, and Cu2+ on morphological parameters of A. oryzae strains RIB40 and RIB143 were estimated. Colony diameter, conidiation, vesicle head size, and stipe width in both strains varied with concentration. Ti4+, Sr2+, Ba2+, Al3+, Fe2+, and Ca2+ affected conidiation in similar tendency between two strains. The effects of Ti4+, V3+, Sr2+, an
